686388097 has 4 divisors (see below), whose sum is σ = 687162816. Its totient is φ = 685613380.

The previous prime is 686388083. The next prime is 686388113. The reversal of 686388097 is 790883686.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-686388097 is a prime.

It is a super-2 number, since 2×686388097² = 942257239406562818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (686388007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 386029 + ... + 387802.

It is an arithmetic number, because the mean of its divisors is an integer number (171790704).

Almost surely, 2^686388097 is an apocalyptic number.

It is an amenable number.

686388097 is a deficient number, since it is larger than the sum of its proper divisors (774719).

686388097 is an equidigital number, since it uses as much as digits as its factorization.

686388097 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 774718.

The product of its (nonzero) digits is 3483648, while the sum is 55.

The square root of 686388097 is about 26199.0094660084. The cubic root of 686388097 is about 882.1110204361. Note that the first 3 decimals are identical.

The spelling of 686388097 in words is "six hundred eighty-six million, three hundred eighty-eight thousand, ninety-seven".